E:11 communication split flow - 3 phase ARTG/AOTG

3 wire remote controller communication check flow

E:65 trip terminal L error flow - Outdoor unit

E:94 trip detection flow - Outdoor unit

E:95 compressor motor control error flow - Outdoor unit

E:64 PFC circuit error flow - Outdoor unit

E:A1 discharge temperature / E:A3 compressor temperature flow - Outdoor unit

E:A5 low pressure error flow - Outdoor unit

1. Confirm caller name, company, site address, indoor model/serial and outdoor model/serial.
2. Confirm exact complaint: error code, operating mode, when it occurs and whether it is repeatable.
3. Confirm safety: no burning smell, water ingress, damaged wiring, repeated breaker trips or refrigerant odour.
4. Confirm tools: multimeter with AC/DC volts, resistance and diode test.
5. Decision point: if caller is not qualified or cannot identify terminals safely, stop at non-invasive checks and arrange authorised attendance.

1. Reset power and confirm if E:11 returns.
2. Check external causes such as poor earth, noise or equipment causing harmonic wave near power cable.
3. Check interconnect and control unit connections for loose connector, open cable or mis-wiring.
4. Check outdoor supply: expected AC198-264 V at outdoor terminal 1-2, L1-N, L2-N and L3-N.
5. Serial signal: check outdoor terminal 2-3. Expected swing AC70-130 V.
6. If reverse transfer signal is abnormal, check outdoor fan motor before outdoor PCB approval.
7. If forward transfer fault remains after wiring and supply are proven, indoor controller PCB and power PCB become suspect.

1. At the rear of the wall controller, confirm Y1 = 12 V/red, Y2 = signal/white, Y3 = COM/black.
2. Measure Y1 to Y3: expected 12 VDC, no less than 11.4 VDC.
3. Manual PCB supply reference: AR*G45/54LHTA = CN6 1-3; ARTG45/54LHTB and ARTG60LHTA = CN140 1-3; other models = CN14 1-3.
4. Remove Y2 from the remote. Measure between remote terminal Y2 and Y3: expected fluctuating 7-11 / 7-12 VDC pulse.
5. Measure between the disconnected Y2 wire going to the indoor unit and Y3: expected fluctuating 7-11 / 7-12 VDC pulse.
6. If no 12 V supply, check indoor PCB remote power supply. If remote has supply but no Y2 pulse, suspect remote controller. If field Y2 has no return pulse, check cable and indoor controller PCB.

1. Isolate power. Check connector is not loose, removed, miswired or open.
2. Disconnect thermistor and measure resistance out of circuit. Compare to actual bulb temperature.
3. Indoor room thermistor rough values from the manual include: 0C 33.6 kΩ, 5C 25.9 kΩ, 10C 20.2 kΩ, 15C 15.8 kΩ, 20C 12.5 kΩ, 25C 10.0 kΩ, 30C 8.0 kΩ, 35C 6.5 kΩ.
4. Outdoor discharge/compressor thermistor values include high resistance at low temperature and lower resistance as temperature rises. Record actual temperature and kΩ, then compare to table.
5. With thermistor removed, check PCB supply at thermistor connector: expected DC5.0 V.
6. Replace thermistor only when resistance is open/short/out of table. Replace PCB only when connector/wiring and thermistor are proven.

1. Power off. Rotate fan by hand and check for obstruction, bearing lock, dropped fan or casing contact.
2. For DC indoor fans, circuit-test between Vm and GND. If short-circuited below 300 kΩ, replace indoor fan motor and controller PCB.
3. For AR*G45/54LHTA AC fan motor, check winding resistances: White-Red 7.73 Ω ±7%, Red-Black 7.08 Ω ±7%, Red-Violet 3.80 Ω ±7%, Violet-Blue 3.80 Ω ±7% at 20C.
4. Record connector condition, motor rotation, resistance and PCB decision.

1. Power off. Rotate fan by hand and check obstruction, bearing lock, fan guard contact or damaged fan.
2. Check outdoor fan motor using circuit-test between Vm and GND. If short-circuited below 300 kΩ, replace outdoor fan motor and main PCB.
3. Outdoor fan motor pin functions: Red DC voltage Vm, Black GND, White Vcc, Yellow Vsp, Brown feedback FG.
4. On E:11 reverse transfer faults, abnormal outdoor fan motor can load the signal path. Check fan motor before outdoor PCB approval.

1. Check EEV connector for loose connector or open cable.
2. Remove connector and check EEV coil resistance: Yellow-Brown, Orange-Red, Blue-Brown, White-Red = 46 Ω ±4 Ω at 20C.
3. Remove connector and check PCB drive voltage: expected DC12 V.
4. Turn on power and listen/feel for EEV start-up operation noise.
5. Check opening/closing effect by temperature difference. Closed valve creates inlet/outlet temperature difference; open valve has no temperature difference.
6. Check strainer. A temperature difference across the strainer suggests internal clogging.

1. Check compressor terminal connection and inverter PCB connection for loose or incorrect wiring.
2. Check winding resistance between U-V, V-W and U-W. Manual value: 0.79 Ω at 20C.
3. If resistance is 0 or infinite, replace compressor.
4. If compressor does not start or stops soon, also check gas pipe valve open, refrigerant leak, strainer clogging and harness condition before compressor approval.
5. If Check Point 1 and 2 do not improve the symptom and compressor is normal, inverter PCB becomes suspect.

1. Use this for E:63 inverter error, E:64 PFC circuit error, E:65 trip terminal L and repeated compressor protection faults.
2. Confirm 3 phase supply is within range and balanced before board approval.
3. Inspect inverter/PFC connections and harnesses for loose connectors, corrosion, open cable or burn marks.
4. Check compressor winding and outdoor fan motor loading before recommending inverter/PFC board.
5. Attach photos and readings to ticket before board approval.

1. Check pressure sensor connector and wiring condition.
2. Compare live pressure to sensor values when available from outdoor display mode.
3. For A5, check valve position, ambient, outdoor fan, EEV/strainer and refrigerant amount before sensor or PCB replacement.
4. Record actual pressure, operating mode, pipe temperatures, sensor reading and refrigerant evidence.

1. Check float switch operation and any blockage by dust.
2. Check connector and shorted / pinched wire.
3. Check drain hose for clogging, traps or poor fall.
4. If all checks are normal and drainage error remains, controller PCB becomes suspect.

1. Check DIP switch settings and address settings against installation manual and refrigerant circuit arrangement.
2. Check total connected indoor unit capacity against outdoor capacity.
3. Check number of connected indoor units and primary/secondary unit setup.
4. Correct settings, reset power and retest before controller PCB or main PCB approval.

1. Check connector is fitted, not miswired and no open cable.
2. Check relevant thermistors are fitted in holders and not pinched or reading incorrectly.
3. Check solenoid coil / valve operation where accessible.
4. Check valve position by piping temperature difference. If valve position is not correct after coil and thermistors are proven, valve may be faulty.
5. If checks pass and error remains, board control becomes suspect.

1. Reset power and confirm if current sensor error returns.
2. Check external causes: voltage drop, momentary open circuit, noise and grounding.
3. Check outdoor electrical component connectors, terminal tightness, miswiring and open cables.
4. If checks do not improve symptom, board-level fault becomes suspect.